fbanklin blighton



(Model.) Y

y n.11". BLIG-HTON.

LOQKING DEVICE PQR BIOLTS.

No. 287,795. .Patented Nov; 6, 1888.

' as seen in Fig. fir.

UNITED. STATES' PATENT -Y @stica D. FRANKLIN BLIGHTON, onToNAWnNDA, Nnw ironie LocKlNeoEvlcE FOR Borre.

SPECIFCATION forming part of Letters4 Patent No.28'7y,795, dated Application filed May lo, 1883. (Modem it appertains to Ina-ke and use the sanne, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, Vwhich forni apart of this specification.

My invention has reference to locking devices for bolts.

My lock is formed of two-tapering lugsjoinedby a band at the larger or outer end, the band being also threaded. The two lugs thus united possess a compressibility which atlows to'be"4 pinched in against the bolt when brought in contact with a proper seat. The seat is formed in one of the parts which is to be secured, or in aseparately-forrned washer, if desired. The lugs are formed thick near their centers, and tapered olf to thin edges at the sides, Thus ,'fornied, when they placed upon the hand they will present a circular interior and an oval or elongated exterioigwhich'insures a neat it uponthe bolt, and prevents the locking device from turning round when placed ina proper seat.

The bolt to be used in combination with this lool; is formed with a square,l polygonal, or other convenientlyshaped head for a wrench to take hold upon when it is desired to tighten up the parts. Beneath the head is a tapering portion, which inaye tend more or less distance toward the threaded` end ott-he bolt. This neck or tapering portion'is intended to iit in the seat provided for it in the part to be joined with a continually-increasing tightness which will serve to draw the` parts vto be united strongly together.

rilhe loclr is set in place in the seat andthe.

, bolt inserted from the other side' and screwed ,loek, showing the lugs.

November 6, 1883.

Instead of 4inserting the lock first and then i' screwing in the bolt from the 4opposite side, the v lock may be forced down upon .the bolt; but'it is preferable to proceed as before explained?.-

It is essential in this invention thatthe lock when in position be incapable of turning.

Y Heretofore the lugs whichhave been used as parts to tighten upon the screwfthreads of .the bolt while said bolt is being screwed into them, or while the nut is being'screwed upon the bolt, have formed a circle, and the edgesy of the lugs have been as thick as the middle,

so that they have tapered in only, one direc tion-i; e. from base to point. This prevented 'their use as a self-holding or locking device. A

washer having lugs tapered, as herein set forth, has been known; but as used upon a washer and upon a locking device or interiorly screwthreaded nuttlie difference is great. Upon the washer they can serve onlyto'fp'ievent said Washer turning in its seat,whi1e upon the nut they answer this function and the further and more important one of closing down uponth/e threads of the boltto hold it securely.

' The accompanying drawings forni a part of this specification, and illustrate what I consider the best ineans for carrying the invention into practice. Figure 1 is a section ofthe parts to be united, with the bolt and lock in place.

the locking device, taken lengthwise of the lugs. Fig. 4. is section of the same, taken across the lugs.

Similar letters of reference indicate corre-- sponding parts yin all .the figures.

A is a rail of a railroad or analogous part to be secured; A. A2, the fish-plates or analol gous 'parts ,on either side. y B is the bolt; B', the square or other conven iently-shaped head for grasping with a wrench.

Fig. 2 is an inverted plan view of the Fig. Bis' a section of B2 is the heck or tapering portion, extending from the head toward the threaded end ofthe bOlt.

, The 100k is formador two tapering: ings, e'v

C2, interiorly screw-threaded, and joined at the larger end by a similarly-threaded ring, C.' These lugs are oval on the exterior,where they forni the endof thelock, and aspace is left be- Y tween them, so as to give' them compressibility whenl drawn into the seat, whereby they are Minimum pinched uponthe sides of the bolt and clamp it securely. The lugs maybe of any suitable length and taper. Thering C,whichjoinsthem, is of any suitable depth, and is preferably so1newhat larger than the l'ugset upon it. The ringis of oval or elongated form,` thus conforming in general outline to the exterior of the lock formed by the lugs.

The fish-plate A is provided with a seat', a', for the neck B2, andthe plate A2 is provided with a tapering oval seat, a2, for the reception of the oval tapering lock.

I have shown my invention applied to railroad-rails and fish-plates; but I would not be understood as confining it to such use, as it is evident that it can be used in every situation requiring a bolt and locking device.

Having thus described my invention, what I y luliiimiutiititimitllninummnmmm. l awww desire to claim, and secure by Letters Patent 1s A locking device for bolts, formed ol' two tapering lugs having thick centers and thin edges, forming a circular interior and an oval exterior, and a' uniting-band secured to the .outer larger end of the lugs, the interior of 

